/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.cypher.internal.compiler.helpers

import scala.collection.immutable

object MapSupport {

  implicit class PowerMap[A, B](m: immutable.Map[A, B]) {

    def fuse(other: immutable.Map[A, B])(f: (B, B) => B): immutable.Map[A, B] = {
      other.foldLeft(m) {
        case (acc, (k, v)) if acc.contains(k) => acc + (k -> f(acc(k), v))
        case (acc, entry)                     => acc + entry
      }
    }
  }

}
